Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...492..213g&link_type=abstract
Astrophysical Journal v.492, p.213
Astronomy and Astrophysics
Astronomy
11
Ism: Dust, Extinction, Ism: Individual Name: Corona Australis Cloud, Stars: Individual Constellation Name: V346 Normae, Stars: Pre-Main-Sequence
Scientific paper
Profiles of the 3 mu m ice band with moderate spectral resolution ( lambda / Delta lambda = 1300) are presented for four young stellar objects (YSOs). Of special interest is a comparison between those for the embedded HH 100 IR source and the FU Orionis star V346 Normae (V346 Nor) near HH 57, whose most recent outburst was in 1983. In the new spectra, there is no sign of the absorption feature at 2.97 mu m attributed by Graham & Chen in 1991 to ammonia ice. We now believe that this identification was spurious. The ice band in V346 Nor has a weaker long wavelength wing than that in HH 100 IR. It matches well a profile observed in the star Elias 13 that lies behind the Taurus dark cloud, and leads to the conclusion that the line of sight to V346 Nor passes through quiescent intracloud material rather than through the dense dust observed in emission at longer wavelengths. Fine structure in the ice-band wing, probably due to C-H stretch absorption, is detected at 3.47 mu m in the embedded objects HH 100 IR and [TS84] 13.1 in the Corona Australis cloud but not in V346 Nor. A second dip at 3.55 mu m, which is plausibly linked to CH3OH, is observed in HH 100 IR.
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